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Search Auto Parts Search 1998 GMC Safari - heater/ac actuator question Sign up here!   Email This Post Auto Repair Home>> Automotive Repair>> AC Auto Repair Help Forum lablady Novice Dec 4, 2006, 5:24 PM Post #1 of 4 (9244 views)      1998 GMC Safari - heater/ac actuator question   We just bought this van and have discovered that the air/heat only comes out the front vents and not to defrost or underneath the dash. We cannot choose where the flow of air (hot/cold) is directed. The switch that controls the blend of air (hot/cold) works fine, the speed switch to blow the air works as well, and the on/off part of the selector switch works fine too. My husband did a little research with the auto parts' store clerk and the research shows that it's an electric actuator not a vacuum-powered actuator for this van. Could the problem be the selector switch or is the problem in the actual actuator? If it's the actuator, how can my husband get to it to replace it or test it? Any help or insights would be greatly appreciated! Thanks!! :) lablady and husband DanD Veteran / Moderator Dec 5, 2006, 5:29 AM Post #2 of 4 (9236 views)      Re: 1998 GMC Safari - heater/ac actuator question   The mode control or air distribution on this vehicle is a vacuum operated system not an electrical one. Most times when there is a vacuum supply problem from the engine as in the black tubing from the engine to the heater controls becomes cracked or broken the heater system would default to the defrost mode. With you saying that yours is always in the vent mode, could be a number of different things causing this. The mode door maybe stuck in one position from something falling into the defroster vent. The mode control selector is not directing vacuum to the proper actuator. Possibly one of the vacuum lines from the selector switch to an actuator is leaking vacuum. Or a bad actuator and it cannot move the mode door. As for who is or isn’t doing what to whom is anyone’s guess. I’ve just looked through the different test procedures and I don’t have one for this scenario. So all I can suggest is to get under the dash and check for vacuum supply; that the mode switch actually switches vacuum delivery to the different lines and that the actuators are actually moving the different doors. Here is a couple of diagrams that may help as in location of the different colors of lines and to whom there connected. Dan. Canadian "EH" sailr New User May 11, 2012, 10:06 AM Post #3 of 4 (8127 views)      Re: 1998 GMC Safari - heater/ac actuator question   Perhaps the Canadian model had the vacuum operation in 1998 but in the US, it is all electrical! Hammer Time Ultimate Carjunky / Moderator May 11, 2012, 11:27 AM Post #4 of 4 (8120 views)      Re: 1998 GMC Safari - heater/ac actuator question   After 6 years, nobody cares. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.   Email This Post   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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